The Counselling Perk
The easiest way to rack up credits even faster is by grabbing the Credit perk that comes from getting the Counselling upgrade for the Medical Wing of your Base of Operations. The perk increases credit gains by 10%. This may not seem like a lot as a bonus on each individual mission but over time that extra 10% will help make you a whole lot richer.
To get the Credit perk, simply head to the laptop in the Medical Wing of your Base of Operations and purchase the Counselling upgrade for 200 supplies. You’ll also get two Talents that may come in useful during battle, too. Win win!